Nifedipine extended-release tablets have the effect of impeding the membrane operation of cardiac muscle and vascular smooth muscle, calcium ions, and inhibiting the influx of calcium ions into the cells, causing a decrease in contractility of the myocardium and vasodilation. By reducing the contractility of the myocardium and the resistance of the peripheral vessels, it can reduce the oxygen consumption of the myocardium, and increase the supply of oxygen to the ischemic parts of the myocardium through the dilation of the coronary vessels and the development of the collateral circulation, which is mainly used in the clinical treatment of chronic stable angina pectoris, vasospastic angina pectoris, and primary hypertension. It is important to note that it should be used with caution in patients with hypotension, severe aortic stenosis and hepatic and renal insufficiency, and may cause allergic reactions, so people with allergies need to be prohibited.